ladybird/Kernel/Forward.h
Liav A 5dcf03ad9a Kernel/Devices: Introduce the LoopDevice device
This device is a block device that allows a user to effectively treat an
Inode as a block device.

The static construction method is given an OpenFileDescription reference
but validates that:
- The description has a valid custody (so it's not some arbitrary file).
  Failing this requirement will yield EINVAL.
- The description custody points to an Inode which is a regular file, as
  we only support (seekable) regular files. Failing this requirement
  will yield ENOTSUP.

LoopDevice can be used to mount a regular file on the filesystem like
other supported types of (physical) block devices.
2024-03-13 15:33:47 -06:00

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C++

/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/DistinctNumeric.h>
#include <Kernel/API/POSIX/sys/types.h>
namespace Kernel {
enum class LockRank;
class BlockDevice;
class CharacterDevice;
class Coredump;
class Credentials;
class Custody;
class Device;
class DeviceControlDevice;
class DiskCache;
class DoubleBuffer;
class File;
class FATInode;
class OpenFileDescription;
class DisplayConnector;
class FileSystem;
class FutexQueue;
class IPv4Socket;
class Inode;
class InodeIdentifier;
class InodeWatcher;
class MountFile;
class Jail;
class KBuffer;
class KString;
class LocalSocket;
class LoopDevice;
class Mutex;
class MasterPTY;
class Mount;
class PerformanceEventBuffer;
class ProcFS;
class ProcFSInode;
class Process;
class ProcessGroup;
class RAMFS;
template<LockRank Rank>
class RecursiveSpinlock;
class Scheduler;
class Socket;
class SysFS;
class SysFSDirectory;
class SysFSRootDirectory;
class SysFSBusDirectory;
class SysFSDevicesDirectory;
class SysFSDirectoryInode;
class SysFSInode;
class TCPSocket;
class TTY;
class Thread;
class ThreadTracer;
class RAMFSInode;
class UDPSocket;
class UserOrKernelBuffer;
class VirtualFileSystem;
class WaitQueue;
class WorkQueue;
namespace Memory {
class AddressSpace;
class AnonymousVMObject;
class InodeVMObject;
class MappedROM;
class MemoryManager;
class PageDirectory;
class PhysicalPage;
class PhysicalRegion;
class PrivateInodeVMObject;
class Region;
class SharedInodeVMObject;
class VMObject;
class VirtualRange;
}
template<LockRank Rank>
class Spinlock;
template<typename LockType>
class SpinlockLocker;
struct InodeMetadata;
struct TrapFrame;
AK_TYPEDEF_DISTINCT_ORDERED_ID(pid_t, ProcessID);
AK_TYPEDEF_DISTINCT_ORDERED_ID(pid_t, ThreadID);
AK_TYPEDEF_DISTINCT_ORDERED_ID(pid_t, SessionID);
AK_TYPEDEF_DISTINCT_ORDERED_ID(pid_t, ProcessGroupID);
AK_TYPEDEF_DISTINCT_ORDERED_ID(uid_t, UserID);
AK_TYPEDEF_DISTINCT_ORDERED_ID(gid_t, GroupID);
}